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Randyflycaster

Which Mayfly Nymphs Hatch on the Bottom?

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What's interesting and frustrating about this subject is that there is different opinions on whether some flies hatch on the bottom. For example, some hatch charts list Hendrickson's has being bottom hatchers.

Two books I have say that they hatch near the surface.

 

Randy

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That video is absolutely BONKERS!!!!!

 

Did they emerge into winged adults or just hatch from the egg into nymphs?

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Normally, the females lay their eggs after fertilization, and then they die. These female mayflies keep the fertilized internally and the fertilized eggs mature and hatch into nymphs just after being laid 10-14 days later.

 

The nymphs still have to grow and mature before hatching into duns a year later.

 

http://en.wikipedia.org/wiki/Cloeon_dipterum

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That video is absolutely BONKERS!!!!!

 

Did they emerge into winged adults or just hatch from the egg into nymphs?

 

Hi wschmitte-

 

Most female mayfly imagoes lay their eggs within 24 hours of having them fertilized by the male imago. After those mayflies lay their eggs, it takes a several weeks for the eggs to mature, and for each nymph to break out of its respective egg.

 

However, several genera of mayflies retain the eggs within their abdomen for a week or more following fertilization, which allows their eggs to mature, so that the nymph is able to escape its egg immediately.following the egg being laid, which is what we see happening in the video.

 

Best regards,

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